Add guarded MLAMBDA FIX declarations

[rsasaki0109]

Summary

• add WP173 guarded MLAMBDA FIX declaration layer on the locked WP172 trajectory
• require WP172 independent consensus, MLAMBDA ratio >= 3, at least 6 satellites, and 5 contiguous epochs
• retain FLOAT on every failed or missing condition

Locked results

• Tokyo: 1,296/11,924 FIX (10.8688%), false-FIX 0, sub-50 cm 46.5112%
• Nagoya: 1,370/7,583 FIX (18.0667%), false-FIX 0
• mandatory negative holdouts: 0 declared FIX
• regenerated independent RTK replay: canonical WP173 trajectory identical
• production audit: 12/12; reproducibility bundle: 38/38

Validation

• Python smoke: 329 passed, 1 skipped
• focused WP173/public/audit/bundle suites pass
• ruff and diff checks pass

Limitation

Tokyo run1 is an operational audit, not a virgin scientific holdout. Most epochs intentionally remain FLOAT.